"*Web developers*: No signals" is incorrect, there is a lot of developer 
interest in this. See this interop 24 focus area proposal for more 
information: https://github.com/web-platform-tests/interop/issues/521. This 
Mozilla bug also has 118 votes: 
https://bugzilla.mozilla.org/show_bug.cgi?id=435426 and this Chromium issue 
has 125 +1s: https://issues.chromium.org/issues/40320391

On Tuesday, 26 November 2024 at 12:07:17 UTC+1 Chromestatus wrote:

> Contact emails moo...@google.com, chri...@chromium.org 
>
> Explainer None 
>
> Specification https://drafts.csswg.org/css-values-5/#attr-notation 
>
> Summary 
>
> Implement the augmentation to attr() specified in CSS Level 5, which 
> allows types besides <string> and usage in all CSS properties (besides 
> pseudo-element 'content'). Example: <style> div { background-color: 
> attr(data-foo type(<color>), red); } </style> <div 
> data-foo="blue">test</div> 
>
>
> Blink component Blink>CSS 
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS> 
>
> Search tags css <http:///features#tags:css>, css-values 
> <http:///features#tags:css-values>, attr <http:///features#tags:attr> 
>
> TAG review https://github.com/w3ctag/design-reviews/issues/513 
>
> TAG review status Pending 
>
> Risks 
>
>
> Interoperability and Compatibility 
>
> No browser has implemented this feature yet. Even though there's no 
> negative signals from other browsers, there's still a minimal 
> interoperability risk that we end up the only implementation. There are 
> also a few known cases where this advanced version behaves differently from 
> the basic version in pseudo-element content property, which is a 
> compatibility risk: - https://bit.ly/2XDhHtg - https://bit.ly/3grF3ur
>
>
> *Gecko*: No signal (https://bugzilla.mozilla.org/show_bug.cgi?id=435426) 
>
> *WebKit*: No signal (https://bugs.webkit.org/show_bug.cgi?id=26609) 
>
> *Web developers*: No signals 
>
> *Other signals*: 
>
> Security 
>
> attr() can be used by injected CSS for data exfiltration. 
> https://github.com/w3c/csswg-drafts/issues/5092
>
>
> WebView application risks 
>
> Does this intent deprecate or change behavior of existing APIs, such that 
> it has potentially high risk for Android WebView-based applications?
>
> None
>
>
> Debuggability 
>
> No additional DevTools support is needed. attr() function is inspectable 
> in DevTools same way as any other CSS substitution function.
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac, 
> Linux, ChromeOS, Android, and Android WebView)? Yes 
>
> Is this feature fully tested by web-platform-tests 
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ? Yes 
>
>
> https://wpt.fyi/results/css/css-values?label=master&label=experimental&aligned&q=attr
>
>
> Flag name on about://flags CSSAdvancedAttrFunction 
>
> Finch feature name CSSAdvancedAttrFunction 
>
> Requires code in //chrome? False 
>
> Tracking bug https://bugs.chromium.org/p/chromium/issues/detail?id=246571 
>
> Estimated milestones 
> Shipping on desktop 133 
> Shipping on Android 133 
> Shipping on WebView 133 
>
> Anticipated spec changes 
>
> Open questions about a feature may be a source of future web compat or 
> interop issues. Please list open issues (e.g. links to known github issues 
> in the project for the feature specification) whose resolution may 
> introduce web compat/interop risk (e.g., changing to naming or structure of 
> the API in a non-backward-compatible way).
> None 
>
> Link to entry on the Chrome Platform Status 
> https://chromestatus.com/feature/4680129030651904?gate=5932337540366336 
>
> This intent message was generated by Chrome Platform Status 
> <https://chromestatus.com>. 
>

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